Typically, the main jet adjustment is part of the electric fuel shutoff solenoid. What's there now, a simple plug? A similar carb I worked on recently had a adjustment needle valve assembly installed where the solenoid should have been. That would be the RIGHT thing to do, if you feel it's necessary to remove the solenoid.
It APPEARS Deere part #RE19406, @ about $12.00 is a the manual adjustment screw assembly to replace the $185.00 solenoid.
Also, there may be something wrong in the venturi area, or little passages in the bottom 1/2 of the carb, leading up to the idle circuit up in the top. There are several passages that lead into the area where the throttle plate closes against the bore that may be clogged, adding to the "will not accelerate" problem. (Idle transfer passages.)
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Today's Featured Article - Piston Ring Removal and Replacement - by Chris Pratt. Piston Ring Removal and Replacement - Replacing rings is a fairly easy process to stretch the engines usability between major rebuilds and cut down on that blue smoke and high oil consumption. Frequently, replacing only the rings is not advisable because by the time you do the teardown and measurement of the components, the pistons are often beyond the manufacturers specification or something else you find will signify the need for a major rebu
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